03_04_LTBT-VLC-853(8UI_5DO_3AO)

6670 185th Avenue Northeast, Redmond, WA 98052 USA Tel: 425.869.8400 Fax: 425.869.8445 LTBT-VLC-853 Rev. 0001 1 of 2
©Alerton Inc. All rights reserved.The Alerton ® BACtalk ® VLC 853 is a versatile, high-performance
BACnet-compliant field controller designed for control of central plant
systems, air handling units, large terminal units, and similar control and
process equipment. As a native BACnet controller, the VLC-853 integrates
seamlessly with your BACnet system. It communicates at up to 76.8 Kbps
on a BACnet MS/TP LAN or can operate as a stand-alone controller.
All VLC 853 control logic is programmed with Alerton's easy-to-learn
graphical programming language, VisualLogic ®. Programming and setup
data is stored in non-volatile flash memory, ensuring stable and reliable
operation. The VLC-853 supports the Alerton Microset and Microset II
intelligent wall sensors, which offer convenient data display, setpoint
adjustment, and technician access to equipment setup parameters.
The VLC 853 is built for high-speed processing, with an internal logical
loop time of 100 msec. Programmable timers also maintain a resolution of
100 msec.
High-resolution, 10-bit analog inputs are field-adjustable for thermistor/
dry contact, 0 5VDC/4 20mA or 0 10VDC. Analog outputs are switch-
selectable for 4 20mA or 0 10VDC. For equipment monitoring, an
onboard LED for each binary output indicates ON/OFF status, and
a separate LED indicates communication activity on the MS/TP LAN.
Features and highlights
Capable Eight 10-bit inputs, five binary outputs, and three 8-bit analog outputs.
Interoperable BACnet-compliant on MS/TP LAN at up to 76.8 Kbps.
Versatile Fully programmable for central plant systems, air handling units,other control and process equipment.
Reliable Extensive onboard filtering, with all program data backed up in nonvolatile flash memory.
Fast
Internal logic loop of 100 msec.
6670 185th Avenue Northeast, Redmond, WA 98052 USA Tel: 425.869.8400 Fax: 425.869.8445 2 of 2LTBT-VLC-853 Rev. 0001©Alerton Inc. All rights reserved.Technical Data
Power 24VAC @ 10VA min., plus binary output loads (80VA max).Utilizes a half-wave rectifier, which allows a single transformer to power multiple VLCs. One leg of 24VAC connects to earth (panel) ground.
Inputs 8 universal inputs with 10-bit resolution. Input 0 can be used for a BACtalk Microset. Inputs 1 7 are jumper-selectable for thermistor/dry contact, 0 5VDC/4 20mA or 0 10VDC.
Binary Outputs 5 outputs, each rated at 24VAC, 0.5A. The outputs utilize hot-switched triacs, which have a common connection to the fused 24VAC supply. Analog Outputs 3 outputs with 8-bit resolution. Each is switch-selectable for 0 10VDC or 4 20mA. 4 20mA outputs are sourced by the VLC.Connected loads must return to the VLC ground. 4 20mA max. load resistance is 1,000 ohms. 0 10VDC min. load resistance is 500 ohms.
24VDC Outputs Two terminals provide up to 250mA (total) of 24VDC to power transducers or other devices.
Processor and memory Motorola AZ-60 processor with onboard flash memory. Flash memory provides non-volatile program and data storage,and allows for encrypted updates to the program for future product enhancements.
Maximum Dimensions 4.9 (125mm)H x 5.4 (136mm)W x 1.4"(36mm)D.
Terminations Removable header-type screw terminals accept 14 24AWG wire. An additional header is provided for easy connection to MS/TP for testing.
Environmental 0 158°F (-17 70°C). 0 95% RH, non-condensing.
Communications BACnet MS/TP LAN up to 76.8 Kbps.
BACnet Conformance An application specific controller (ASC); tested and approved by BTL. See Protocol Implementation Conformance Statement (PICS).
Ratings
Listed Underwriters Laboratory for Open Energy Management
Equipment (PAZX) under the UL Standard for Safety 916. Listing
includes both U.S. and Canadian certification.
EMC Directive 89/336/EEC (European CE Mark).
FCC Part 15, Subpart J, Class A.Ordering information
Item number
Description VLC-8538 inputs, 5 binary triac outputs, 3 analog outputs。